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security: Add a hook for the point of notification insertion

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Add a security hook that allows an LSM to rule on whether a notification
message is allowed to be inserted into a particular watch queue.

The hook is given the following information:

 (1) The credentials of the triggerer (which may be init_cred for a system
     notification, eg. a hardware error).

 (2) The credentials of the whoever set the watch.

 (3) The notification message.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jamorris@linux.microsoft.com>
cc: Casey Schaufler <casey@schaufler-ca.com>
cc: Stephen Smalley <sds@tycho.nsa.gov>
cc: linux-security-module@vger.kernel.org
This commit is contained in:
David Howells
2020-02-12 13:58:35 +00:00
parent 0858caa419
commit 344fa64ef8
4 changed files with 38 additions and 0 deletions
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15
include/linux/security.h
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@@ -56,6 +56,8 @@ struct mm_struct;
struct fs_context;
struct fs_parameter;
enum fs_value_type;
struct watch;
struct watch_notification;
/* Default (no) options for the capable function */
#define CAP_OPT_NONE 0x0
@@ -1275,6 +1277,19 @@ static inline int security_locked_down(enum lockdown_reason what)
}
#endif /* CONFIG_SECURITY */
#if defined(CONFIG_SECURITY) && defined(CONFIG_WATCH_QUEUE)
int security_post_notification(const struct cred *w_cred,
const struct cred *cred,
struct watch_notification *n);
#else
static inline int security_post_notification(const struct cred *w_cred,
const struct cred *cred,
struct watch_notification *n)
{
return 0;
}
#endif
#ifdef CONFIG_SECURITY_NETWORK
int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk);